[CUDA] Place all CUDA sections in __NV_CUDA segment on Mac.

[tra]

Summary

That's where CUDA SDK binaries appear to put them on Mac.

[Hahnfeld]

LGTM. These were the section names I suspected, but I wasn't able to verify back then.

clang/lib/CodeGen/CGCUDANV.cpp

FatBinStr = new llvm::GlobalVariable(
         /*isConstant=*/true, llvm::GlobalValue::ExternalLinkage, nullptr,
         "__hip_fatbin", nullptr,
         llvm::GlobalVariable::NotThreadLocal);
     cast<llvm::GlobalVariable>(FatBinStr)->setSection(FatbinConstantName);
 
     FatMagic = HIPFatMagic;
   } else {
     if (RelocatableDeviceCode)
-      // TODO: Figure out how this is called on mac OS!
-      FatbinConstantName = "__nv_relfatbin";
+      FatbinConstantName = CGM.getTriple().isMacOSX()
+                               ? "__NV_CUDA,__nv_relfatbin"
+                               : "__nv_relfatbin";
     else
       FatbinConstantName =
           CGM.getTriple().isMacOSX() ? "__NV_CUDA,__nv_fatbin" : ".nv_fatbin";
     // NVIDIA's cuobjdump looks for fatbins in this section.
     FatbinSectionName =
         CGM.getTriple().isMacOSX() ? "__NV_CUDA,__fatbin" : ".nvFatBinSegment";
 
-    // TODO: Figure out how this is called on mac OS!
-    ModuleIDSectionName = "__nv_module_id";
+    ModuleIDSectionName = CGM.getTriple().isMacOSX()
+                              ? "__NV_CUDA,__nv_module_id"
+                              : "__nv_module_id";
     ModuleIDPrefix = "__nv_";
 
     // For CUDA, create a string literal containing the fat binary loaded from
     // the given file.
     FatBinStr = makeConstantString(CudaGpuBinary->getBuffer(), "",
                                    FatbinConstantName, 8);
     FatMagic = CudaFatMagic;
   }